scholarly journals Relationship between Fe-Cu-REEs mineralization and magnetic basement faults using multifractal modeling in Tarom region, NW Iran

Episodes ◽  
2021 ◽  
Author(s):  
Ahmad Adib ◽  
Masoumeh Nabilou ◽  
Peyman Afzal
Keyword(s):  
Nw Iran ◽  
Basement Faults ◽  
Magnetic Basement ◽  
Multifractal Modeling

Empirical observations relating near‐surface magnetic anomalies to high‐frequency seismic data and Landsat data in eastern Sheridan County, Montana

Geophysics ◽  
1991 ◽  
Vol 56 (10) ◽  
pp. 1553-1570 ◽  
Author(s):  
John A. Andrew ◽  
Duncan M. Edwards ◽  
Robert J. Graf ◽  
Richard J. Wold
Keyword(s):  
Seismic Data ◽  
Magnetic Anomalies ◽  
Oil Fields ◽  
Data Types ◽  
Seismic Line ◽  
Near Surface ◽  
The North ◽  
Basement Faults ◽  
Magnetic Basement ◽  
Seismic Sections

Our empirical synergistic correlations of aeromagnetic and seismic data and a Landsat lineament interpretation revealed lineations on the magnetic map that have expression on seismic sections. We observed a conjugate set of northwest‐southeast and northeast‐southwest trending magnetic lineaments (zones which offset and truncate near‐surface magnetic anomalies). We believe these OZs (offset zones) represent lateral faults in a wrench‐fault system. Lateral offsets appear to be 100s of meters to a few kilometers (fractions of a mile to a few miles). We observed a direct correlation between OZs and vertical faults in seismic data. Faults on seismic sections extend from near the surface to near the seismic basement. The faults are most pronounced in the Upper Cretaceous reflectors and seem to disappear with depth. Fault throws are inconsistent (reversing throw across faults). OZs trend northeast‐southwest in the north half of the study area and both northeast‐southwest and northwest‐southeast in the south half. The OZ direction of northeast‐southwest in the north half of the survey is confirmed with seismic data. The northwest‐southeast seismic line contains numerous faults and the northeast‐southwest seismic line contains few faults. Most northeast‐southwest faults do not appear to reach seismic basement and are not seen in an interpretation of the magnetic basement. In two cases, northwest‐southeast OZs and correlative Landsat lineaments coincide with mapped magnetic basement faults. These magnetic basement faults can be seen in seismic data too. Faults trending northwest‐southeast may represent Precambrian faults reactivated during the Laramide Orogeny. Movement along these faults possibly generated the northeast‐southwest faults. Most oil fields have an associated near‐surface magnetic anomaly. Other near‐surface magnetic anomalies occur over obvious, untested (in 1985), seismic character or amplitude anomalies in seismic events which correlate with producing intervals in the oil fields. This synergistic correlation is the most important single observation from our study. Different data types and interpretation techniques identified the same geologic trends and prospective geographical areas. This fundamentally important information is often lost in bickering over which filter or processing technique to use or in arguments over which data type is “more important” than others. Further, if the synergistic correlation of data types were not done, the importance of the anomalous features in each individual data type may not have been recognized.

Prospection of Au mineralization based on stream sediments and lithogeochemical data using multifractal modeling in Alut 1:100,000 sheet, NW Iran

2014 ◽  
Vol 8 (6) ◽  
pp. 3867-3879 ◽  
Author(s):  
Seyed Ali Hosseini ◽  
Peyman Afzal ◽  
Behnam Sadeghi ◽  
Taraneh Sharmad ◽  
Seyed Vahid Shahrokhi ◽  
...  
Keyword(s):  
Stream Sediments ◽  
Nw Iran ◽  
Multifractal Modeling

scholarly journals Identification of magnetic anomalies based on ground magnetic data analysis using multifractal modeling: a case study in Qoja-Kandi, East Azerbaijan Province, Iran

2015 ◽  
Vol 2 (4) ◽  
pp. 1137-1157
Author(s):  
E. Mansouri ◽  
F. Feizi ◽  
A. A. Karbalaei Ramezanali
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Anomalies ◽  
Magnetic Data ◽  
Borehole Data ◽  
Nw Iran ◽  
Magnetic Elements ◽  
Ground Magnetic ◽  
Modeling Data ◽  
East Azerbaijan ◽  
Multifractal Modeling

Abstract. Ground magnetic anomaly separation using reduction-to-the-pole (RTP) technique and the fractal concentration-area (C-A) method has been applied to the Qoja-Kandi prosepecting area in NW Iran. The geophysical survey that resulted in the ground magnetic data was conducted for magnetic elements exploration. Firstly, RTP technique was applied for recognizing underground magnetic anomalies. RTP anomalies was classified to different populations based on this method. For this reason, drilling points determination with RTP technique was complicated. Next, C-A method was applied on the RTP-Magnetic-Anomalies (RTP-MA) for demonstrating magnetic susceptibility concentration. This identification was appropriate for increasing the resolution of the drilling points determination and decreasing the drilling risk, due to the economic costs of underground prospecting. In this study, the results of C-A Modeling on the RTP-MA are compared with 8 borehole data. The results show there is good correlation between anomalies derived via C-A method and log report of boreholes. Two boreholes were drilled in magnetic susceptibility concentration, based on multifractal modeling data analyses, between 63 533.1 and 66 296 nT. Drilling results show appropriate magnetite thickness with the grades greater than 20 % Fe total. Also, anomalies associated with andesite units host iron mineralization.

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